get me

Today, at work, somebody asked me if how I was doing? Not like to greet me or say hello, it was like, are you happy? I have this habit when I work of getting into this "don't give a shit" mood. Straight-faced whatever Brian comes out and everybody thinks I am sad...or down...or something. I just don't give a shit. Is that healthy? I am not sure if anybody gets me. ha.